Fix glob syntax

Globs are only intended to support ** as a directory, i.e. **/*.cc
not **.cc.

Bug: 129411151
Test: m nothing
Change-Id: I8208309b8191620f600af17a54974e53a6237b5f
diff --git a/Android.bp b/Android.bp
index 6d335a6..9293000 100644
--- a/Android.bp
+++ b/Android.bp
@@ -137,7 +137,7 @@
     ],
 
     srcs: [
-        "src/manager/**.cc",
+        "src/manager/**/*.cc",
     ],
 }